One who prevents themself from scoring sexually , usually by being to nice to take advantage of a situation or possibly by being too shy .
I cant believe i gave myself a self cock block last night , she was so drunk it was in the bag
Self-inflicted cock block
by doing or saying something so stupid, cheesy, or inappropriate that you instantly ruin any chance of scoring with the targeted girl. The girl will inevitably laugh at you later with her friends
I self cock blocked myself yesterday by telling a girl if she was a new sandwich at McDonald's she would be called McGorgeous. She spewed her drink in my face.